August c



(No Model.) 2 sheets-sheet 1. A. Cl` GHRISTENSEN'.

PISTON GAS METER. No. 373,923. Patented Nov. 29, 1887.

(No Model.) 2 Sheets-*Sheet A'. C. CHRISTENSEN.

PIsToN GAS METER. Y

Patented Nov. 29, 1887.

n. PETZRS. Mmmm. walmim.' 0.6.

, located in grooves of the slide-valves.

the following is a specification.

UNITED STATESI vParlava* Ormes."

AUGUST O. CHRISTENSEN, OF BROOKLYN, NEV YORK.

PISTON GAS-METER.

SPECIFICATION forming part of Letters Patent No. 373,923, dated November 29, 1887,

Application filed March 11, 1887.

To all whom it may concern:

Be it known that I, AUeUs'r. C. CHRIsTEN- SEN, of Brooklyn, county of Kings, and State of New York, have invented certain newand useful Improvements in Gas-Meters, of which This invention relates to certain improvements in the gas and steam piston meter for which Letters Patent were granted to me heretofore, No. 340,763, dated April 27 1886, the improvement serving to adapt the meter in a more perfect manner for the purpose of measuring gas, and more especially natural gas, as it can be accurately run with a pressure from half an ounce per square inch to a pressure of hundreds of pounds per square inch, asl the friction between .the stationary and movable parts is entirely removed and the piston balanced in such a manner that it responds reliably to the pressure of the passing gas.

The invention consists of a gasmeter the inclosing-casing of which is madein the shape of tWo cylinders, reciprocating pistons arranged in said cylinders and Vformed of end disks, and connecting-stems, said pistons being suspended by center rods from carriages which rest on anti-friction balls and ways in a chest at the upper part of the casing. The slide-valves are located at the bottom of the cylinders iutermediately between the end disks of the pistons and guided over the outlet-ports by tiXed transverse rods, the friction with the bottom of the cylinders being diminished by intermediate anti-friction rollers A In the accompanying drawings, Figure 1 represents a vertical longitudinal section of my improved gas-meter,taken on line ma, Fig. 2. Fig. 2 is a horizontal section of the same on the line y y, Fig. 1, with parts of the piston-stem broken away. Fig. 3 is a vertical transverse section taken on line z z, Fig. 1. Fig. 4 is a bottom view of the gas-meter. Fig. 5 is a vertical longitudinal section on line k k, Fig. 2; and Fig. 6 is a vertical transverse section on line 1 1, Fig. 5l

Similar letters of reference indicate corre sponding parts.

The inclos'ing casing or body of my improved gas-meter is formed of two parallel Serial No. 230,572. (No model.)

hollow cylinders, A A', of equal size, which are closed by heads A2, secured thereto, said cylinders being cast in one piece and provided with a chest, A3, at the upper part, that extends transversely across both cylinders, and with a bottom, A", having vertical passages for the gas. The .chest A3 serves for receiving the usual counter employed in piston meters of this class and for providing the 6o ways d,on which the carriages C Oare guided, from which the pistons B B are suspended.

The pistons B B are constructed of hollow sheet-metal heads or disks b b, that are'united by central hollow or solid stems, b' b. The pis- 65 tous B B are suspended from the carriages C O by vertical rods b2, which pass through longitudinal slots at the upper parts of the cylinders and are attached to the carriages C C' and the stems b b. The suspension-rods are 7o located centrally between the end disks, b b, so as-to properly balance the pistons.

The carriages C C are provided with longitudinal grooves d at their under side, and rest on anti-friction balls or rollers d2, which rollers are guided in the grooves d and horizontal ways d at the top part of the cylinders A A', as shown in Figs. l and 8. By suspending the pistons B B from the carriages C O the friction of the same with the cylinders 8o is entirely removed, while by the balancing of the pistons on the carriages and the lightness of the pistons themselves the uniform and reliable movement that responds even to very low gas-pressure is obtained.

The slide-valves D D', instead of being arranged in the chest A3, are located at the bottom of the cylinders intermediately between the piston-heads and made to conform at their under side to the curvature of the bottom of 9o the cylinders A A.

The slide-valves D D' are provided, like the suspension-carriage of the pistons, with longitudinal grooves (which grooves may also be arranged in the cylinders) and supported on anti-friction balls e, by which the friction of the slide-valves on the bottom of the cylinders is reduced and the motion rendered easy, so as to exert no drag on the pistons. The

lateral shifting ofthe slide-valves D D is pre- Ico vented by tixed transverse guide-rods f, that are secured to the cylinders, as shown in Fig.

3, and extended across the top of the slide- Valves, said rods working in connection with stopsf at the top of the slide-valves, so as to keep the slide-valves in proper position over the ports while in transportation, as well as during the working of the meter.

The slide-valves D D are arranged with central lugs, g, at the ends, which form alternately contact with the end disks of the pistons, which move thereby the slide-valves alternately in opposite directions, as shown in Figs. l and 5.

The gas-outlet ports are opened or closed by the slidevalves D D when the pistons are near the end of each stroke.

The piston and slide-valve of one cylinder control the outlet of gas for the piston of the other cylinder, as customary in piston meters of this class. The gas enters to the interior of the cylinders A A ot' the meter through the inlet-pipe h, that is located at the center of one of the cylinders, as shown in Figs. 2 and 3. The gas fills thetspace of both cylinders between the end disks of the pistons, as the longitudinal partition between the same is open at the middle portion. The gas passes' from the spaces between the end disks of the pistons to the open outlet-ports h at the lower part of the cylinders, and from the same through diagonal channels at the botom of the casing to the spaces between the end disks of the pistons and the heads of the easing, so as to move the pistons in opposite directions and shift thereby the slide-valves in both cylinders. The gas is conducted off from the spaces between the opposite disks of the cylinders and the heads of the casing by the diagonal channels to the parts below the slide-valves and dischargeports and channel h2, as shown clearly in Figs. l, 2, and 3.

The diagonal connectingychannels are made in the form of the pipes FF, and are attached by short offsets to the bottoni of the inclosingcasing of the meter,and rigidly secured thereto by bails]c2 and fastening-boltsf3, in the same manner as shown in my former patent referred to.

The general arrangement of the cross-pipes and the operation of the meter is the same in the patent before mentioned, the essential feature of novelty in this application being the suspending and balancing of the pistons from anti-friction carriages, the arrangement of the slide-valves at the bottom of the cylinders between the end disks of the pistons, and the reduction of the friction of the slide-valves with the bottom of the cylinders by theanti-friction balls.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination of an inclosing-casing formed of two cylinders, reciprocating pistons in said cylinders, carriages guided on ways of the chest, anti-friction rollers between said carriages and the ways, and suspension-rods connecting the carriages and pistons, substantially as set forth.

2. The combination of an inclosing-casing having a chest at the upper part and a bottom with vertical passages, reciprocating pistons formed of end disks, connecting-stems, antifriction carriages guided on ways of the chest, suspension-rodsconnecting the carriages with the stems of the pistons, slide-valves located at the bottom of the cylinders between the end disks of the pistons, and outlet-ports and diagonal cross-channels at the bottom of the casing, substantially as set forth.

3. The combination of an inclosingcasing formed of two cylinders, reciprocating pistons in said cylinders, carriages guided on ways of the chest, suspension-rods connecting the carriages and pistons, slide-valves located at the bottom of the cylinders and operated by the pistons, inlet and outlet ports, and diagonal channels at the bottom ofthe casing, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

AUGUST C. CHRISTEN SEN.

Witnesses:

MARTIN PETRY, CHARLEs FLErscHACKER. 

